Had to pass this on just in case anyone uses these when traveling. I bought it to use in case the sink at the hotel didn’t have a plug mechanism and I wanted to do a bit of laundry. I went through IAD security fine, but my bag was pulled at LHR. I didn’t mind- goodness knows I would rather they be more cautious than not. The young man showed me what the machine picked up, and it was this drain cover. He said it was bc of the material. They brushed it with a tool that he said picks up anything explosive. They smiled at this novice traveler’s mortified reaction- “I didn’t even need to bring it!”, but it definitely surprised me.
Here’s the cover that caused all the commotion:
https://www.homedepot.com/p/DANCO-5-in-Flat-Suction-Sink-Stopper-in-White-89042/203193999
My daughter had a giggle bc I repeatedly told her that her knitting needles were going to be problematic. She went through with no problems…but my drain cover got me in trouble!